:root {
  --ink: #17122b;
  --muted: #665f7b;
  --surface: #ffffff;
  --surface-soft: #f6f4ff;
  --surface-warm: #fff8ed;
  --line: rgba(42, 25, 82, 0.12);
  --purple-950: #1c0c3f;
  --purple-900: #281052;
  --purple-800: #3d1878;
  --purple-700: #5725a8;
  --purple-600: #6d35d4;
  --purple-500: #8b5cf6;
  --pink: #ec4899;
  --cyan: #22d3ee;
  --yellow: #facc15;
  --green: #34d399;
  --orange: #fb923c;
  --shadow-sm: 0 10px 28px rgba(38, 20, 77, 0.08);
  --shadow-md: 0 22px 60px rgba(38, 20, 77, 0.14);
  --shadow-lg: 0 32px 90px rgba(25, 10, 61, 0.24);
  --radius-sm: 14px;
  --radius-md: 22px;
  --radius-lg: 32px;
  --container: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #fbfaff;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}
body.modal-open { overflow: hidden; }
img { max-width: 100%; display: block; }
a { color: inherit; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }

.skip-link {
  position: fixed;
  left: 16px;
  top: 12px;
  z-index: 9999;
  transform: translateY(-150%);
  padding: 10px 16px;
  border-radius: 999px;
  background: #fff;
  color: var(--purple-900);
  font-weight: 800;
  transition: transform .2s ease;
}
.skip-link:focus { transform: translateY(0); }

.container {
  width: min(calc(100% - 40px), var(--container));
  margin-inline: auto;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 1000;
  padding: 14px 0;
  transition: background .25s ease, box-shadow .25s ease, padding .25s ease;
}
.site-header.is-scrolled {
  padding: 9px 0;
  background: rgba(248, 246, 255, .9);
  box-shadow: 0 8px 32px rgba(30, 12, 63, .08);
  backdrop-filter: blur(18px);
}
.nav-shell {
  min-height: 62px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 8px 12px 8px 18px;
  border: 1px solid rgba(255,255,255,.17);
  border-radius: 22px;
  background: rgba(255,255,255,.08);
  backdrop-filter: blur(16px);
}
.site-header.is-scrolled .nav-shell {
  border-color: var(--line);
  background: rgba(255,255,255,.74);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 900;
  letter-spacing: -.03em;
  color: #fff;
}
.site-header.is-scrolled .brand { color: var(--purple-950); }
.brand img {
  width: 42px;
  height: 42px;
  object-fit: contain;
  filter: drop-shadow(0 6px 12px rgba(0,0,0,.12));
}
.brand-copy { display: grid; line-height: 1.05; }
.brand-name { font-size: 1.08rem; }
.brand-tag { font-size: .69rem; font-weight: 700; opacity: .72; letter-spacing: .03em; }

.main-nav { display: flex; align-items: center; gap: 6px; }
.main-nav a {
  text-decoration: none;
  color: rgba(255,255,255,.82);
  font-size: .9rem;
  font-weight: 750;
  padding: 10px 13px;
  border-radius: 12px;
  transition: background .2s ease, color .2s ease, transform .2s ease;
}
.main-nav a:hover { color: #fff; background: rgba(255,255,255,.1); transform: translateY(-1px); }
.site-header.is-scrolled .main-nav a { color: #4d4561; }
.site-header.is-scrolled .main-nav a:hover { color: var(--purple-800); background: #eee9ff; }
.nav-actions { display: flex; align-items: center; gap: 9px; }
.nav-android {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 40px;
  padding: 9px 13px;
  border: 1px solid rgba(255,255,255,.22);
  border-radius: 14px;
  color: #fff;
  background: rgba(255,255,255,.1);
  text-decoration: none;
  font-size: .82rem;
  font-weight: 850;
  white-space: nowrap;
}
.nav-android:hover { color: var(--purple-950); background: #fef08a; border-color: #fde047; }
.site-header.is-scrolled .nav-android { color: var(--purple-800); background: #f0ecff; border-color: transparent; }
.site-header.is-scrolled .nav-android:hover { color: var(--purple-950); background: #fef08a; }
.selflearner-native-app .nav-android { display: none; }
.nav-link-button,
.nav-primary {
  border: 0;
  border-radius: 14px;
  padding: 10px 15px;
  font-size: .88rem;
  font-weight: 850;
}
.nav-link-button {
  color: #fff;
  background: rgba(255,255,255,.11);
  border: 1px solid rgba(255,255,255,.2);
}
.site-header.is-scrolled .nav-link-button {
  color: var(--purple-800);
  background: #f0ecff;
  border-color: transparent;
}
.nav-primary {
  color: var(--purple-950);
  background: linear-gradient(135deg, #fef08a, #facc15);
  box-shadow: 0 9px 22px rgba(250, 204, 21, .25);
}
.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 14px;
  background: rgba(255,255,255,.12);
  color: #fff;
}
.site-header.is-scrolled .menu-toggle { background: #eee9ff; color: var(--purple-800); }
.menu-toggle span,
.menu-toggle::before,
.menu-toggle::after {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  margin: 4px auto;
  border-radius: 999px;
  background: currentColor;
  transition: transform .2s ease, opacity .2s ease;
}
.menu-toggle.is-open span { opacity: 0; }
.menu-toggle.is-open::before { transform: translateY(6px) rotate(45deg); }
.menu-toggle.is-open::after { transform: translateY(-6px) rotate(-45deg); }

.hero {
  position: relative;
  min-height: 860px;
  display: grid;
  align-items: center;
  padding: 150px 0 92px;
  color: #fff;
  background:
    radial-gradient(circle at 16% 20%, rgba(236,72,153,.28), transparent 28%),
    radial-gradient(circle at 84% 24%, rgba(34,211,238,.23), transparent 30%),
    radial-gradient(circle at 60% 84%, rgba(139,92,246,.22), transparent 34%),
    linear-gradient(145deg, #170833 0%, #281052 50%, #35146b 100%);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .38;
  background-image:
    radial-gradient(circle, rgba(255,255,255,.9) 1px, transparent 1.5px),
    radial-gradient(circle, rgba(255,255,255,.55) 1px, transparent 1.5px);
  background-size: 86px 86px, 132px 132px;
  background-position: 0 0, 33px 18px;
  mask-image: linear-gradient(to bottom, #000 0%, rgba(0,0,0,.65) 65%, transparent 100%);
}
.hero::after {
  content: "";
  position: absolute;
  inset: auto -10% -170px;
  height: 320px;
  border-radius: 50%;
  background: #fbfaff;
}
.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1.03fr) minmax(410px, .97fr);
  align-items: center;
  gap: 62px;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 18px;
  padding: 8px 13px;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 999px;
  background: rgba(255,255,255,.09);
  color: #f5efff;
  font-size: .8rem;
  font-weight: 850;
  letter-spacing: .045em;
  text-transform: uppercase;
  backdrop-filter: blur(10px);
}
.eyebrow-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 6px rgba(52,211,153,.13);
}
.hero h1 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(3.2rem, 7vw, 6.4rem);
  line-height: .96;
  letter-spacing: -.066em;
  text-wrap: balance;
}
.gradient-text {
  display: block;
  padding-bottom: .08em;
  color: transparent;
  background: linear-gradient(110deg, #fef08a 0%, #f9a8d4 42%, #a5f3fc 88%);
  -webkit-background-clip: text;
  background-clip: text;
}
.hero-lead {
  max-width: 650px;
  margin: 26px 0 0;
  color: rgba(255,255,255,.77);
  font-size: clamp(1.05rem, 1.7vw, 1.25rem);
  line-height: 1.75;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 13px; margin-top: 32px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 52px;
  padding: 13px 20px;
  border: 1px solid transparent;
  border-radius: 16px;
  text-decoration: none;
  font-weight: 900;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.button:hover { transform: translateY(-2px); }
.button-primary {
  color: var(--purple-950);
  background: linear-gradient(135deg, #fef08a, #facc15);
  box-shadow: 0 16px 34px rgba(250,204,21,.22);
}
.button-secondary {
  color: #fff;
  background: rgba(255,255,255,.09);
  border-color: rgba(255,255,255,.22);
  backdrop-filter: blur(12px);
}
.button-secondary:hover { background: rgba(255,255,255,.14); }
.button-dark { color: #fff; background: var(--purple-900); }
.button-soft { color: var(--purple-800); background: #eee9ff; }
.hero-note {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 24px;
  margin-top: 24px;
  color: rgba(255,255,255,.68);
  font-size: .88rem;
  font-weight: 650;
}
.hero-note span::before { content: "✓"; margin-right: 7px; color: #86efac; font-weight: 900; }

.orbit-stage {
  position: relative;
  min-height: 520px;
  display: grid;
  place-items: center;
  isolation: isolate;
}
.orbit-glow {
  position: absolute;
  width: 390px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(139,92,246,.32), rgba(34,211,238,.08) 45%, transparent 70%);
  filter: blur(8px);
}
.orbit-ring {
  position: absolute;
  width: min(94%, 500px);
  aspect-ratio: 1;
  border: 1px solid rgba(255,255,255,.17);
  border-radius: 50%;
  transform: rotate(-10deg);
}
.orbit-ring.ring-two { width: min(72%, 380px); transform: rotate(30deg); border-style: dashed; }
.orbit-core {
  position: relative;
  z-index: 3;
  width: 184px;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  padding: 22px;
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 50%;
  background: linear-gradient(145deg, rgba(255,255,255,.2), rgba(255,255,255,.06));
  box-shadow: inset 0 1px 0 rgba(255,255,255,.25), 0 28px 72px rgba(8,3,25,.4);
  backdrop-filter: blur(20px);
}
.orbit-core img { width: 94px; filter: drop-shadow(0 16px 22px rgba(0,0,0,.25)); }
.orbit-core::after {
  content: "Curiosity";
  position: absolute;
  bottom: 18px;
  font-weight: 900;
  letter-spacing: .04em;
  font-size: .75rem;
}
.orbit-node {
  position: absolute;
  z-index: 4;
  width: 148px;
  padding: 14px;
  border: 1px solid rgba(255,255,255,.17);
  border-radius: 18px;
  background: rgba(255,255,255,.1);
  box-shadow: 0 18px 42px rgba(6,2,22,.24);
  backdrop-filter: blur(16px);
  text-align: left;
  animation: hoverNode 6s ease-in-out infinite;
}
.orbit-node strong { display: block; margin-top: 7px; font-size: .92rem; }
.orbit-node small { color: rgba(255,255,255,.64); font-size: .72rem; }
.orbit-node .node-icon { font-size: 1.55rem; }
.node-one { top: 7%; left: 5%; }
.node-two { top: 8%; right: 2%; animation-delay: -1s; }
.node-three { top: 42%; right: -3%; animation-delay: -2s; }
.node-four { bottom: 4%; right: 11%; animation-delay: -3s; }
.node-five { bottom: 4%; left: 8%; animation-delay: -4s; }
.node-six { top: 43%; left: -5%; animation-delay: -5s; }
@keyframes hoverNode { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-9px); } }

.proof-strip {
  position: relative;
  z-index: 4;
  margin-top: -54px;
}
.proof-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(255,255,255,.92);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(18px);
}
.proof-item { padding: 24px 26px; }
.proof-item + .proof-item { border-left: 1px solid var(--line); }
.proof-value { display: block; color: var(--purple-800); font-size: 1.65rem; font-weight: 950; letter-spacing: -.04em; }
.proof-label { color: var(--muted); font-size: .82rem; font-weight: 720; }

.section { padding: 104px 0; }
.section-soft { background: var(--surface-soft); }
.section-dark {
  color: #fff;
  background:
    radial-gradient(circle at 15% 15%, rgba(236,72,153,.17), transparent 28%),
    radial-gradient(circle at 85% 75%, rgba(34,211,238,.14), transparent 28%),
    var(--purple-950);
}
.section-heading { max-width: 760px; margin-bottom: 40px; }
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  color: var(--purple-700);
  font-size: .78rem;
  font-weight: 950;
  letter-spacing: .11em;
  text-transform: uppercase;
}
.section-dark .kicker { color: #c4b5fd; }
.section-heading h2 {
  margin: 0;
  font-size: clamp(2.15rem, 4.5vw, 4rem);
  line-height: 1.06;
  letter-spacing: -.055em;
  text-wrap: balance;
}
.section-heading p { margin: 17px 0 0; color: var(--muted); font-size: 1.06rem; }
.section-dark .section-heading p { color: rgba(255,255,255,.67); }

.world-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 18px;
}
.world-card {
  position: relative;
  min-height: 285px;
  display: flex;
  flex-direction: column;
  padding: 25px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.world-card:hover { transform: translateY(-7px); box-shadow: var(--shadow-md); border-color: rgba(109,53,212,.25); }
.world-card:nth-child(1), .world-card:nth-child(2) { grid-column: span 6; }
.world-card:nth-child(n+3) { grid-column: span 4; }
.world-card.featured {
  min-height: 340px;
  color: #fff;
  border-color: transparent;
  background:
    radial-gradient(circle at 80% 12%, rgba(255,255,255,.2), transparent 27%),
    linear-gradient(145deg, #5b21b6, #2e1065);
}
.world-card.featured.alt { background: linear-gradient(145deg, #0f766e, #164e63); }
.world-top { display: flex; justify-content: space-between; align-items: start; gap: 16px; }
.world-icon {
  width: 55px;
  height: 55px;
  display: grid;
  place-items: center;
  border-radius: 17px;
  background: #f2edff;
  font-size: 1.65rem;
}
.featured .world-icon { background: rgba(255,255,255,.14); }
.world-badge {
  padding: 6px 9px;
  border-radius: 999px;
  color: var(--purple-800);
  background: #eee9ff;
  font-size: .7rem;
  font-weight: 900;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.featured .world-badge { color: #fff; background: rgba(255,255,255,.14); }
.world-card h3 { margin: 25px 0 9px; font-size: 1.4rem; line-height: 1.15; letter-spacing: -.035em; }
.world-card p { margin: 0; color: var(--muted); font-size: .92rem; }
.featured p { color: rgba(255,255,255,.7); }
.world-link { display: inline-flex; align-items: center; gap: 8px; margin-top: auto; padding-top: 26px; color: var(--purple-700); font-size: .84rem; font-weight: 900; }
.featured .world-link { color: #fff; }
.world-card::after {
  content: "";
  position: absolute;
  width: 150px;
  height: 150px;
  right: -65px;
  bottom: -75px;
  border-radius: 50%;
  background: rgba(109,53,212,.07);
}
.featured::after { background: rgba(255,255,255,.08); }

.loop-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 12px;
  counter-reset: loop;
}
.loop-step {
  position: relative;
  min-height: 190px;
  padding: 22px 18px;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 20px;
  background: rgba(255,255,255,.065);
  backdrop-filter: blur(12px);
}
.loop-step::before {
  counter-increment: loop;
  content: "0" counter(loop);
  display: block;
  margin-bottom: 28px;
  color: #c4b5fd;
  font-size: .75rem;
  font-weight: 950;
  letter-spacing: .12em;
}
.loop-step h3 { margin: 0 0 7px; font-size: 1.08rem; }
.loop-step p { margin: 0; color: rgba(255,255,255,.57); font-size: .83rem; }

.mission-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 17px; }
.mission-card {
  position: relative;
  min-height: 260px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #fff;
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  transition: transform .22s ease, box-shadow .22s ease;
}
.mission-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.mission-emoji { font-size: 2.4rem; }
.mission-card h3 { margin: 22px 0 8px; font-size: 1.25rem; letter-spacing: -.03em; }
.mission-card p { margin: 0 0 22px; color: var(--muted); font-size: .9rem; }
.mission-card span { color: var(--purple-700); font-size: .83rem; font-weight: 900; }
.mission-card:nth-child(1) { background: linear-gradient(160deg, #fff, #f1ecff); }
.mission-card:nth-child(2) { background: linear-gradient(160deg, #fff, #e9fbff); }
.mission-card:nth-child(3) { background: linear-gradient(160deg, #fff, #fff4e6); }
.mission-card:nth-child(4) { background: linear-gradient(160deg, #fff, #f0fff8); }

.spotlight {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.spotlight-card {
  position: relative;
  min-height: 360px;
  padding: 34px;
  display: flex;
  flex-direction: column;
  justify-content: end;
  overflow: hidden;
  border-radius: var(--radius-lg);
  color: #fff;
  background: linear-gradient(145deg, #4c1d95, #7c3aed);
  box-shadow: var(--shadow-md);
}
.spotlight-card:nth-child(2) { background: linear-gradient(145deg, #0f766e, #155e75); }
.spotlight-art {
  position: absolute;
  inset: 28px 28px auto auto;
  width: 150px;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border-radius: 36px;
  background: rgba(255,255,255,.12);
  font-size: 4.8rem;
  transform: rotate(8deg);
}
.spotlight-card h3 { position: relative; margin: 0; max-width: 470px; font-size: 2rem; line-height: 1.08; letter-spacing: -.04em; }
.spotlight-card p { position: relative; max-width: 490px; color: rgba(255,255,255,.7); }
.spotlight-card a { position: relative; width: max-content; margin-top: 9px; color: #fff; font-weight: 900; }

.install-panel {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  align-items: center;
  gap: 38px;
  overflow: hidden;
  padding: clamp(34px, 6vw, 68px);
  border-radius: 34px;
  color: #fff;
  background:
    radial-gradient(circle at 15% 20%, rgba(236,72,153,.24), transparent 26%),
    radial-gradient(circle at 85% 70%, rgba(34,211,238,.2), transparent 28%),
    linear-gradient(145deg, #27104e, #42187f);
  box-shadow: var(--shadow-lg);
}
.install-panel h2 { margin: 0; font-size: clamp(2.2rem, 4vw, 3.8rem); line-height: 1.02; letter-spacing: -.055em; }
.install-panel p { max-width: 620px; color: rgba(255,255,255,.68); font-size: 1.02rem; }
.install-points { display: grid; gap: 10px; margin: 22px 0 28px; color: rgba(255,255,255,.82); font-weight: 720; }
.install-points span::before { content: "✓"; margin-right: 9px; color: #86efac; }
.install-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.install-actions .button { margin: 0; }
.android-download-button { text-decoration: none; }
.android-release-line { display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: center; margin: 18px 0 0!important; color: rgba(255,255,255,.72)!important; font-size: .78rem!important; }
.android-release-line strong { color: #fff; }
.android-release-sha { flex-basis: 100%; max-width: 620px; overflow-wrap: anywhere; font-family: ui-monospace,SFMono-Regular,Consolas,monospace; font-size: .68rem; }
.device-stack { position: relative; min-height: 350px; }
.device {
  position: absolute;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255,255,255,.2);
  background: linear-gradient(145deg, rgba(255,255,255,.18), rgba(255,255,255,.07));
  box-shadow: 0 28px 60px rgba(9,3,25,.34);
  backdrop-filter: blur(18px);
}
.device-laptop { width: 330px; height: 210px; right: 0; top: 22px; border-radius: 22px 22px 12px 12px; }
.device-phone { width: 125px; height: 245px; left: 12px; bottom: 8px; border-radius: 28px; transform: rotate(-7deg); }
.device-screen { width: calc(100% - 20px); height: calc(100% - 20px); display: grid; place-items: center; border-radius: inherit; background: linear-gradient(145deg, #4c1d95, #0f766e); font-size: 3rem; }
.device-laptop::after { content: ""; position: absolute; width: 360px; height: 12px; bottom: -18px; border-radius: 3px 3px 12px 12px; background: rgba(255,255,255,.28); }

.feedback-layout { display: grid; grid-template-columns: .85fr 1.15fr; gap: 58px; align-items: start; }
.feedback-copy { position: sticky; top: 120px; }
.feedback-copy h2 { margin: 0; font-size: clamp(2.2rem, 4vw, 3.7rem); line-height: 1.04; letter-spacing: -.055em; }
.feedback-copy p { color: var(--muted); }
.feedback-card {
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: #fff;
  box-shadow: var(--shadow-md);
}
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { display: grid; gap: 7px; }
.field-full { grid-column: 1 / -1; }
.field label { color: #43385b; font-size: .8rem; font-weight: 850; }
.field input, .field select, .field textarea {
  width: 100%;
  border: 1px solid #ddd6f3;
  border-radius: 14px;
  padding: 13px 14px;
  color: var(--ink);
  background: #fcfbff;
  outline: none;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.field textarea { min-height: 140px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--purple-500); box-shadow: 0 0 0 4px rgba(139,92,246,.12); }
.form-status { min-height: 24px; margin: 12px 0 0; color: var(--muted); font-size: .83rem; }
.form-status.success { color: #047857; }
.form-status.error { color: #b91c1c; }

.faq-grid { display: grid; grid-template-columns: .75fr 1.25fr; gap: 60px; }
.faq-intro h2 { margin: 0; font-size: clamp(2.2rem, 4vw, 3.7rem); line-height: 1.04; letter-spacing: -.055em; }
.faq-intro p { color: var(--muted); }
.faq-list { display: grid; gap: 12px; }
.faq-list details { border: 1px solid var(--line); border-radius: 18px; background: #fff; box-shadow: 0 8px 24px rgba(38,20,77,.05); }
.faq-list summary { position: relative; list-style: none; padding: 20px 54px 20px 21px; font-weight: 850; cursor: pointer; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; right: 20px; top: 16px; font-size: 1.5rem; color: var(--purple-600); transition: transform .2s ease; }
.faq-list details[open] summary::after { transform: rotate(45deg); }
.faq-list details p { margin: 0; padding: 0 21px 20px; color: var(--muted); }

.site-footer { padding: 72px 0 24px; color: #fff; background: #14082f; }
.footer-grid { display: grid; grid-template-columns: 1.35fr .8fr .8fr 1fr; gap: 34px; }
.footer-brand p { max-width: 370px; color: rgba(255,255,255,.56); }
.footer-logo { display: inline-flex; align-items: center; gap: 11px; font-size: 1.25rem; font-weight: 900; }
.footer-logo img { width: 45px; }
.footer-col h3 { margin: 0 0 15px; font-size: .86rem; color: #c4b5fd; text-transform: uppercase; letter-spacing: .09em; }
.footer-col a { display: block; width: max-content; max-width: 100%; margin: 8px 0; color: rgba(255,255,255,.65); text-decoration: none; font-size: .88rem; }
.footer-col a:hover { color: #fff; }
.footer-bottom { display: flex; justify-content: space-between; gap: 24px; margin-top: 54px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.09); color: rgba(255,255,255,.42); font-size: .78rem; }

.dialog {
  width: min(560px, calc(100% - 28px));
  max-height: min(820px, calc(100vh - 30px));
  padding: 0;
  overflow: auto;
  border: 0;
  border-radius: 28px;
  color: var(--ink);
  background: #fff;
  box-shadow: 0 36px 110px rgba(19,6,49,.45);
}
.dialog::backdrop { background: rgba(17,7,43,.72); backdrop-filter: blur(7px); }
.dialog-inner { padding: 28px; }
.dialog-head { display: flex; justify-content: space-between; gap: 20px; align-items: start; }
.dialog-head h2 { margin: 0; font-size: 1.8rem; letter-spacing: -.04em; }
.dialog-close { width: 40px; height: 40px; border: 0; border-radius: 50%; color: var(--purple-800); background: #eee9ff; font-size: 1.35rem; }
.auth-tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; margin: 24px 0; padding: 5px; border-radius: 14px; background: #f4f1fb; }
.auth-tab { border: 0; border-radius: 10px; padding: 10px; color: var(--muted); background: transparent; font-weight: 850; }
.auth-tab.is-active { color: var(--purple-800); background: #fff; box-shadow: 0 5px 16px rgba(38,20,77,.08); }
.auth-panel[hidden] { display: none; }
.auth-panel { display: grid; gap: 14px; }
.checkbox-row { display: flex; gap: 9px; align-items: flex-start; font-size: .8rem; color: var(--muted); }
.checkbox-row input { margin-top: 4px; }

.reveal { opacity: 0; transform: translateY(22px); transition: opacity .65s ease, transform .65s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 1020px) {
  .main-nav { display: none; }
  .menu-toggle { display: block; }
  .main-nav.is-open {
    position: absolute;
    left: 20px;
    right: 20px;
    top: 82px;
    display: grid;
    padding: 13px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
    box-shadow: var(--shadow-md);
  }
  .main-nav.is-open a { color: var(--ink); }
  .hero-grid { grid-template-columns: 1fr; gap: 38px; }
  .hero-copy { max-width: 830px; }
  .orbit-stage { min-height: 480px; max-width: 650px; width: 100%; margin-inline: auto; }
  .world-card:nth-child(n) { grid-column: span 6; }
  .loop-grid { grid-template-columns: repeat(3, 1fr); }
  .mission-grid { grid-template-columns: repeat(2, 1fr); }
  .install-panel { grid-template-columns: 1fr; }
  .device-stack { max-width: 500px; width: 100%; margin-inline: auto; }
  .feedback-layout, .faq-grid { grid-template-columns: 1fr; gap: 34px; }
  .feedback-copy { position: static; }
  .footer-grid { grid-template-columns: 1.3fr 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  .container { width: min(calc(100% - 28px), var(--container)); }
  .site-header { padding: 9px 0; }
  .nav-shell { min-height: 56px; padding: 6px 8px 6px 12px; border-radius: 17px; }
  .brand img { width: 36px; height: 36px; }
  .brand-tag { display: none; }
  .nav-actions .nav-link-button { display: none; }
  .nav-android { padding: 9px 11px; font-size: .76rem; }
  .nav-primary { padding: 9px 12px; font-size: .78rem; }
  .hero { min-height: auto; padding: 125px 0 120px; }
  .hero h1 { font-size: clamp(3rem, 15vw, 4.7rem); }
  .hero-lead { font-size: 1rem; }
  .hero-actions { display: grid; }
  .button { width: 100%; }
  .hero-note { display: grid; gap: 8px; }
  .orbit-stage { min-height: 430px; transform: scale(.92); margin: -10px auto; }
  .orbit-node { width: 125px; padding: 11px; }
  .orbit-node small { display: none; }
  .node-three { right: -7%; }
  .node-six { left: -7%; }
  .proof-strip { margin-top: -52px; }
  .proof-grid { grid-template-columns: repeat(2, 1fr); }
  .proof-item:nth-child(3) { border-left: 0; border-top: 1px solid var(--line); }
  .proof-item:nth-child(4) { border-top: 1px solid var(--line); }
  .proof-item { padding: 18px; }
  .section { padding: 78px 0; }
  .world-grid { grid-template-columns: 1fr; }
  .world-card:nth-child(n) { grid-column: auto; min-height: 250px; }
  .world-card.featured { min-height: 300px; }
  .loop-grid { grid-template-columns: 1fr 1fr; }
  .mission-grid, .spotlight { grid-template-columns: 1fr; }
  .spotlight-card { min-height: 330px; }
  .install-panel { border-radius: 26px; padding: 30px 22px; }
  .device-stack { min-height: 290px; transform: scale(.85); transform-origin: center; }
  .device-laptop { right: -22px; }
  .device-phone { left: -8px; }
  .form-grid { grid-template-columns: 1fr; }
  .field-full { grid-column: auto; }
  .feedback-card { padding: 22px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-bottom { flex-direction: column; }
}

@media (max-width: 460px) {
  .brand-name { font-size: .93rem; }
  .nav-primary { display: none; }
  .nav-android-label { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
  .nav-android { width: 40px; justify-content: center; padding-inline: 0; }
  .orbit-stage { min-height: 390px; transform: scale(.78); margin: -45px -12% -30px; width: 124%; }
  .proof-value { font-size: 1.35rem; }
  .proof-label { font-size: .72rem; }
  .loop-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-brand { grid-column: auto; }
  .dialog-inner { padding: 22px; }
}

@media (min-width: 360px) and (max-width: 460px) {
  .nav-android-label { position: static; width: auto; height: auto; overflow: visible; clip: auto; white-space: nowrap; }
  .nav-android { width: auto; padding-inline: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}